| 12345678910111213141516171819202122232425 | package doortype Screen struct {	Panels []Panel}func (s *Screen) AddPanel(panel Panel) {	s.Panels = append(s.Panels, panel)}func (s *Screen) Output() string {	var result string	for idx := range s.Panels {		result += s.Panels[idx].Output()	}	return result}func (s *Screen) Update() string {	var result string	for idx := range s.Panels {		result += s.Panels[idx].Update()	}	return result}
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